Your audience can be anybody, children, adults, or any specific group of people. The audience is your reader.
The phrase <em>the antique fire truck </em>is used as a complete subject, because you are including all of these words to form a subject, so it cannot be a simple one (just one word). It isn't a compound subject either, because that would be two or more words connected with a conjunction <em>and, </em>or some other one.
Answer:
C. an additional viewpoint to consider regarding whiskers
The answer is D.) it creates humor and surprise that the once enemies fell in love and marry
